Week 7 Lab Report - Vinegar Analysis.docx - Experiment 10...

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Experiment 10 – Vinegar AnalysisIntroduction:The objective of this experiment is to determine the percent by mass of acetic acid in vinegar.Procedures and methods:
Procedure A:First, a vinegar sample was prepared. The volume of the vinegar sample was calculated, which was to be used to neutralize 25 mL of the premade sodium hydroxide solution that contains a molar concentration of .1 M NaOH. A given for the vinegar was that its density was 1 gram/mL and its percent by mass of acetic acid was 5 %.These calculations were recorded in the Data and Calculation section ofthe lab report. The mass of a clean and dry 125 mL or 250 mL Erlenmeyer flask was then measured, and the volume of vinegar found to neutralize the 25 mL of sodium hydroxide was then added to the flask. The mass of the flask containing the calculated volume of vinegar was measured, and then subtracted from the mass of the flask containing the vinegar to give you just the mass of the vinegar. After, 2 drops of phenolphthalein were to the same flask, and the walls of theflask were rinsed with 20 mL of deionized water that was just boiled. This was done twice, once for the sample of vinegar labelled 19, and once for the sample of vinegar labelled 8. After the solutions were made correctly in the 2 Erlenmeyer flasks, a clean 50 mL buret was rinsed with about 5 mL of the premade NaOH solution. It is important to note a funnel was used when pouring the NaOH solution into the buret to make sure no drops stick to the walls of the buret. Then, once

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